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(N0 Modem I J. P. BOGAN DEVICE FOR REDUCING THE DIAMETER OP METALRODS'OR WIRES.

Patented Mar. 3, 1885.

FIG.2.

FIGZ.

UNirnn Starts ATFNT ar es.

JAMES F. BOGAN, OF EAST BOSTON, MASS, ASSIGNOR TO GEORGE E. MAR- VIN, OFBOSTON, RONELLO F. PRATT, OF EVERETT, AND XVILLIAM E. OARLETON, OFOHARLESTOIVN, MASS.

DEVICE FOR REDUCING THE DIAMETER OF METAL RODS R WIRE.

SPECIFICATION forming part of Letters Patent No. 313,253, dated March 3,1885.

(No model.)

T0 at whom it may concern.-

Be it known that I, J AMES F. BocliN, a citi zen of the United States,residing at East Boston, in the county of Sufi'olk and State ofMassachusetts, have invented a new and useful Improvement in MillingDevices, of which the following is a specification.

My invention relates to an improved means for reducing the diameter ofportions of a [0 metal rod or wire; and it consists of an elongatedblock of metal having a series of holes extending the whole length ofthe block, the hole at one end being of the smallest required size, andthe holes increasing in size or diame- I5 ter throughout the length ofthe block. In one side of the block is a dovetailed groove extending thewhole length of the block, in

which is fitted to slide a metal block or bar having a cutting-edge ateach end, which cutting-edge is made to project over a portion of one ofthe holes, in which is inserted the wire to be reduced, the slidingblock being held in position in the groove by means ofa screw. The wireor rod is secured in a lathe, and the device is held in the hand whilethe wire is spun through the proper hole.

Referring to the accompanying drawings, Figure 1 is a perspective viewof my device. Fig. 2 is a front view of the same. Fig. 3 is 0 a rearview, and Fig. 4 is a transverse section. Figs. 5 to 8 are detail viewsof the sliding cutter-bar. Figs. 9 and 10 represent rods or wires ofdifferent sizes as reduced by the cutters.

A represents an elongated rectangular block of metal pierced with aseries of holes, the hole at one end being of a size to fit the smallestwire required to be operated upon, and the holes increasing in sizetoward the opposite end of the block to fit wires of different sizes.Fig. 2 represents the front or face side of the block A, that being theside which the wire to be operated upon enters.

In the rear of the block A is a groove ex- 5 tending the whole length ofthe block, and adapted to receive a sliding dovetailed bar or block, B,which may be a third, more or less, of the length of the block A.

On each end of the bar B is formed a cutter,

b, as shown, the portions forming the cuttingedges being about one-halfthe width of the bar B.

Through the bar B passes a screw, 0, by which the said bar is heldsecurely in place.

In a recess on the under side of the cutter 5 5 B is fitted a thinplate, 1), against which the screw 0 bears, and is designed to cover ahole in case the cutter-bar is set so that the screw comes over a hole.

The form of the cutters is shown in Fig. 8, which is a section on theline at y of Fig. 6.

In operation the wire to be milled or reduced in diameter in part isfirst secured in a lathe. The end of'the wireisthen passed into the holeof the size which the wire fits. The cutter b at one end of the bar 13is then set to project over a portion of one of the holes, as shown, forinstance, in the hole marked 5, so as to cut and reduce the diameter ofthe wire as required. Should it be desirable to make portions of thesame wire of different diameters, as shown in Figs. 9 and 10, the cutteris farther advanced over the hole, when the size of the wire will bestill further reduced, and so the operation may be continued asrequired.

The device can be held in the hand while the wire or stock isspun in thelathe.

In the ordinary method of milling wire it is necessary to use adifferent cutting-tool in reducing the size of portions of the wire,while in my improved device the cutter can at once he set to cut thedifferent portions of the same hole in the block.

WVhat I claim as my invention is 1. A milling device consisting of thelongitudinally-grooved block A, having a series of perforations ofdifferent sizes formed in the grooved portion thereof, and theadjustable cutter-bar B, secured in the groove and adapted 0 to reducethe diameter of a wire passed through one of said perforations,substantially as described.

2. The combination of the longitudinally grooved and perforated block A,the sliding 5 cutter-bar B, provided with a cutting-edge, b, at eachend, and the screw (3, for adjustably securing the cutter-bar in thegrooved por tion of the block, substantially as shown and to thisspecification in the presence of two subdescribed. scribing witnesses.

3. The combination of the grooved and perforated block A, the cutter-barB, the plate D, JAMES BOGAN' 5 and screw 0, substantially as and for thepur- Witnesses:

pose set forth. J os. H. ADAMS,

In testimony whereof Ihave signed my name E. PLANTA.

